uses crt;
var a:array[1..200]of real;
i,n:integer;
tb:real;
begin
clrscr;
readln(n);
for i:=1 to n do readln(a[i]);
tb:=0;
for i:=1 to n do tb:=tb+a[i];
writeln(tb/n:4:2);
readln;
end.
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